"Design a cylindrical tank with..." Volume&Surface Area help required.

Question: You are in charge of a tank to be used for water storage. Your boss has told you that he wants a cylindrical tank with a minimum capacity of 300,000 cubic feet. Your boss wants to spend the least possible amount painting the tank. Design a tank to meet this objective.

(Shake) I know I have to use volume and surface area to solve this, but I'm not sure how to go about it. Word problems and me just don't get along very well. (Crying)